This paper presents the proposal and experimental demonstration of a microwave photonic bandpass filter structure based on a multiwavelength semiconductor optical amplifier (SOA) ring laser, an optical phase modulator, and a segment of single-mode fiber as a dispersive element. Experimental results show multiple-tap microwave photonic bandpass filter by using a power-equalized multiwavelength SOA ring laser as the optical source. Two laser configurations, one with a linearly chirped fiber Bragg grating (LCFBG) to compensate the dispersion of the laser cavity and one without the LCFBG, are compared for their multiwavelength laser outputs and the corresponding microwave photonic bandpass filters' response. The two microwave photonic bandpass filters have free spectral ranges (FSRs) ~1.26 GHz and 1.85 GHz. The maximal main-to-secondary sidelobe ratio of the microwave filter is above 10 dB.
We experimentally demonstrate a temperature-stable multiwavelength erbium-doped fiber laser source using a high-birefringent photonic crystal fiber (HiBi-PCF) as the birefringent component of the Sagnac loop filter within the laser cavity. Three different high-birefringence (Hi-Bi) fibers are used in the loop filter to compare the temperature stability of the fiber laser systems: polarization-maintaining erbium-doped fiber (PM-EDF), panda Hi-Bi fiber, and HiBi-PCF. Because of the high birefringence and low temperature sensitivity of the HiBi-PCF, fiber length in the loop is greatly reduced and the temperature stability of the system is dramatically enhanced.
A novel tunable multiwavelength erbium-doped fiber laser source based on a Sagnac loop filter is proposed and experimentally demonstrated. The filter, which is coupled together with the laser cavity, consists of a normal 3-dB fiber coupler, a polarization controller (PC1) and a segment of high-birefringence (Hi-Bi) fiber. The active gain medium, which is a polarization-maintaining erbium-doped fiber (PM-EDF) with an elliptical core, leads to possible multi-frequency lasing output at room temperature. In experiment, by changing the setting of the polarization controller (PC2), multiple frequency lasing lines with different wavelength spacing have been obtained. By applying some pressure to the PM-EDF, continuously tunable multiwavelength lasing output is achieved. Experimental results have shown several stable output lasing wavelengths with high extinction ratio at room temperature.
A novel spacing-tunable multiwavelength erbium-doped fiber laser source based on a Sagnac loop filter is proposed and experimentally demonstrated. The filter, which is coupled together with the laser cavity, consists of a normal 3-dB fiber coupler, a polarization controller (PC1), and a segment of high-birefringence (Hi-Bi) fiber. The active gain medium, which is a polarization-maintaining erbium-doped fiber (PM-EDF) with an elliptical core, leads to possible multifrequency lasing output at room temperature. In the experiment, by changing the setting of the polarization controller (PC2), multiple-frequency lasing lines with different wavelength spacing are obtained. Experimental results show several stable output lasing wavelengths with high extinction ratios at room temperature.
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